补充请教一下：MK02的头文件只有GPIOA和B，但是我发现32脚的封装都有C,和D，是否有问题，谢谢
/* GPIO - Peripheral instance base addresses */
/** Peripheral GPIOA base address */
#define GPIOA_BASE (0x400FF000u)
/** Peripheral GPIOA base pointer */
#define GPIOA ((GPIO_Type *)GPIOA_BASE)
/** Peripheral GPIOB base address */
#define GPIOB_BASE (0x400FF040u)
/** Peripheral GPIOB base pointer */
#define GPIOB ((GPIO_Type *)GPIOB_BASE)
/** Array initializer of GPIO peripheral base pointers */
#define GPIO_BASES { GPIOA, GPIOB }
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